home *** CD-ROM | disk | FTP | other *** search
- HP3000.BWR HP-3000 Kermit "Beware" File October 1991
-
- HP-3000 Kermit documentation reflects version 1.0 (circa 1985), but the
- program has been updated several times since then. See the file HP3000.ANN
- (the program release announcements) for a list of new features. Anyone who
- would like to update the documentation, please feel free! The following
- comments apply to version 1.1 of the program, and may or may not be valid for
- the current version.
-
- ------------------------------
-
- Date: Mon 25 Mar 85 12:08:26-PST
- From: Ted Shapin <BEC.SHAPIN@USC-ECL.ARPA>
- Subject: KERMIT parity problems
- To: info-kermit-request@CU20B.ARPA
- Postal-address: Beckman Instruments, Inc.
- Postal-address: 2500 Harbor X-11, Fullerton, CA 92634
- Phone: (714)961-3393
-
- Frank,
- I found the problem. Your suggestion to set KERMIT-20 to log debugging
- to a file in 8-bit mode was the key. I found out that both CP-6 and
- HP3000 Kermits were sending even parity so the ^A was sent as 201 octal
- and not recognized on the PC end.
-
- At the end is a note for others on HP3000 Kermit. Honeywell CP-6 is still being
- modified by its author, Lee Hallin at Los Angeles HW office (altho he is
- doing it on his own time and I believe will make it available to Columbia
- when done).
-
- Also, it's interesting to note that when I go from the PC THRU KERMIT-20
- to the HP3000 or Honeywell, KERMIT-20 strips off the high order bit in
- terminal emulation mode so everything works. This had me puzzled for a
- while!
-
- Ted.
- = = =
- I had trouble communicating with HP3000 Kermit from MSKERMIT
- until I found the following:
-
- Set parity even on the micro. When you first connect to the
- HP3000, it expects input from a terminal that uses the ACK/ENQ
- protocol. Log on to the HP system by typing CR and control-F
- until you see a : which is the HP3000 prompt. Then logon to
- the HP specifying your terminal type, e.g. HELLO ABC.DEF;TERM=9
- control-F. You will then be able to terminate your lines with
- just the CR.
-
- Ted Shapin
-
- -------
-
- Reportedly, HP-3000 Kermit does not set its packet number back to zero
- between sessions. This means that you have to restart the program each
- time you want to use it. (18 Mar 87)
-
- ------------------------------
-
- Date: Wed, 08 Aug 90 12:23:31 EDT
- From: Jeffrey R Kell <JEFF%UTCVM@cuvmb.cc.columbia.edu>
- Subject: HP-3000 Kermit usage note
-
- After noting some particularly sluggish throughput using HP3000 Kermit,
- particularly on the newer systems running MPE/XL, I began experimenting
- with various configurations and options. A few results were particularly
- noteworthy and constitute a "usage note" that should be included somewhere
- in the package (BWR?) and does not modify any code.
-
- HP3000 Kermit runs with HANDSHAKE XON, and generally requires HANDSHAKE XON
- on the PC-side as well to eliminate overruns during uploads at high speeds.
- You will not notice this (or need it) at low speeds although there may be
- a number of retries if the system is not ready for the next block before it
- is sent. Thus a local HANDSHAKE XON insures integrity, but slows down the
- transfer rate to a near-ridiculous level.
-
- However, as of MPE/XL 1.2, typehead is available (a poor implementation IMHO
- but that's another issue). Since Kermit turns off echo during transfers, the
- annoying typeahead echo is also turned off, and thus doesn't adversely affect
- transfers. Simply turn typeahead on, and no local HANDSHAKE XON is needed!
- The system buffers any packets sent before it is "ready" for them up to the
- limit of the typeahead buffer. If this buffer is filled, the system does a
- flow-control xoff/xon (apparently, at least I was not able to force it to lose
- data even at 19.2 Kbaud). Throughput increases up to 4x have been observed
- using typeahead rather than local HANDSHAKE XON.
-
- <Jeff>
-
- | Jeffrey R Kell, Dir Tech Services | UTC Postmaster/Listserv co-ord. |
- | Admin Computing, 117 Hunter Hall |Bitnet: JEFF@UTCVM.BITNET |
- | Univ of Tennessee at Chattanooga |JEFF%UTCVM.BITNET@CUNYVM.CUNY.EDU |
- | Chattanooga, TN 37403 | Bell: (615)-755-4551 |
-
- ------------------------------
-
-